package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    //使用md5算法对password进行加密，然后再比对

    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        //对前端传过来的密码进行md5加密，然后在进行比对，保证整个系统的安全性
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /*
    * 添加员工
    * */
    //为什么会有DTO，见pojo内有注解
    @Override
    public void save(EmployeeDTO employeeDTO) {
        //下面要对emploueeDTO里面有些没有的属性进行设置
        Employee employee = new Employee();
        //使用对象映射，将EmployeeDTO的属性->Employee的属性
        BeanUtils.copyProperties(employeeDTO, employee);
        //设置默认值,用户的状态：1->启用；2->禁用(为了方便后期的维护设置了常量值)
        employee.setStatus(StatusConstant.ENABLE);
        //设置默认值，默认的密码为123456，使用md5加密(同理使用常量，方便后期的维护)
        employee.setPassword((DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes())));
        //设置默认值，用户的创建时间和修改时间
        /*employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());*/
        //设置默认值，用户的创建人和修改人
        //TODO使用下面的表明该方法后期还需要进行维护或升级
        /*employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());*/
        //链接到Mapper层（持久层）
        employeeMapper.insert(employee);
    }

    /*
    * 分页查询
    * */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page < Employee > page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total=page.getTotal();
        List < Employee > records=page.getResult();
        return new PageResult(total, records);
    }

    /*
    * 员工状态转换
    * */
    @Override
    public void startOrStop(Integer status, Long id) {
        //传统写法
        /*Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);*/
        //由于实体类中有Builder注解，所以可以这样写(链式编程)
        Employee employee = Employee.builder().status(status).id(id).build();
        employeeMapper.update(employee);
    }

    /*
    * 根据id查询员工信息
    * */
    @Override
    public Employee getByid(Long id) {
        Employee employee = employeeMapper.getByid(id);
        employee.setPassword("****");
        return employee;
    }

    /*
    * 修改员工信息
    * */
    //这里调用了之前员工状态变换的代码，在xml配置文件中对所有的字段都加了if，所以这里就不用再写了
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        /*employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());*/
        employeeMapper.update(employee);
    }
}
